You can start off from here as you can earn money from your post on different threads, making threads and I think you could also earn when you get replies on your threads. I think all these are written in the forum's policy, if actually one is dedicated to working here you will earn a good amount though not compared to someone earning full time income.
You could try out some other paid to post sites similar to trendi, just different policies; beermoney forum, forum coin, and bizdustry. I believe working on some of these posting sites would help improve your online earnings